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  1. Prepare
  2. Java
  3. Data Structures
  4. Java Arraylist
  5. Discussions

Java Arraylist

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823 Discussions

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  • suryasivakumar15
     + 0 comments
            ArrayList <ArrayList> matrix = new ArrayList<>();
        Scanner s = new Scanner(System.in);
        
        int lineCount = s.nextInt();
        //System.out.println("LineCount= " + lineCount);
        
        s.nextLine();
        
        for(int i=0; i<lineCount; i++){
            ArrayList tmpAL = new ArrayList<>();
            String[] stmp = s.nextLine().trim().split(" ");
            
            for(int j=0; j<stmp.length; j++){
               tmpAL.add(stmp[j]);
               //System.out.println("stmp " + stmp[j]);
            }
            
            matrix.add(tmpAL);
        }
        
        int queryCount = s.nextInt();
        //System.out.println("QC: " + queryCount);
        
        for(int i=0; i<queryCount; i++){
            int x = s.nextInt();
            int y = s.nextInt();
          
            //System.out.println(matrix.get(x-1).get(y));
            
            try{
                System.out.println(matrix.get(x-1).get(y));
            } catch(Exception ex){
                System.out.println("ERROR!");
            }
        }
        
        s.close();
    }

  • dhdhdcbsndnvcb
     + 0 comments
    class Solution {
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        int length = scn.nextInt();
        ArrayList<Integer>[] lista = new ArrayList[length + 1];
        int a = 1;
        while (a <= length) {
            lista[a] = new ArrayList<>();
            lista[a].add(scn.nextInt()) ;
            for (int j = 1; j < lista[a].get(0) + 1 ; ++j) {
                lista[a].add(scn.nextInt());
            }
            ++a;
        }
        int queries = scn.nextInt();
        while (queries > 0) {
            int x = scn.nextInt();
            int z = scn.nextInt();
            if (z <= lista[x].get(0)) {
                System.out.println(lista[x].get(z));
            } else if (z > lista[x].get(0) || lista[x] == null){
                 System.out.println("ERROR!");
            }
            --queries;
        }
    }
}

  • nikhithavarakuti
     + 0 comments
    `
public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        ArrayList<ArrayList<Integer>> al=new ArrayList<>();
        int n=sc.nextInt();
        for(int i=0;i<n;i++){
            int q=sc.nextInt();
            ArrayList<Integer> temp=new ArrayList<>();
            int x=0;
            while(x<q){
                temp.add(sc.nextInt());
                x++;
            }
            al.add(temp);
        }
        int q=sc.nextInt();
        for(int i=0;i<q;i++){
            int r=sc.nextInt();
            int c=sc.nextInt();
            try{
                int ele=al.get(r-1).get(c-1);
                System.out.println(ele);
            }
            catch(Exception e){
                System.out.println("ERROR!");
            }
        }
    }

    `

  • AH3laly
     + 0 comments
        public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        Integer n = scanner.nextInt();
        Integer[][] map = new Integer[n][];

        // Populate the Map
        for(int i = 0; i < n; i++){
            Integer firstDigit = scanner.nextInt();
            if(firstDigit > 0){
                map[i] = new Integer[firstDigit]; 
                for(int j = 0; j < map[i].length; j++){
                    map[i][j] = scanner.nextInt();
                }
            } else {
                map[i] = new Integer[]{};
            }
        }

        // Answer Queries
        Integer queries = scanner.nextInt();
        for(int k = 0; k < queries; k++){
            Integer y = scanner.nextInt() - 1;
            Integer x = scanner.nextInt() - 1;
            if(
                y < 0 || x < 0 || 
                y > map.length -1 || x > map[y].length -1
            ){
                System.out.println("ERROR!");
            } else {
                System.out.println(map[y][x]);
            }
        }
    }
}

  • hoanmai12345
     + 0 comments

    import java.util.*;

    public class HR082502 {

    public static void main (String[] args){
    try(Scanner sc = new Scanner(System.in)){
        //it is n lines
        int n = sc.nextInt();// 
        ArrayList<ArrayList<Integer>> arr = new ArrayList<>();

       for(int i=0; i <n; i++){
        int d = sc.nextInt();
        ArrayList<Integer> midArr = new ArrayList<>();
            for(int j =0; j<d;j++){
                midArr.add(sc.nextInt());
            }
        arr.add(midArr);
       }
       //q queries
       int q = sc.nextInt(); 
       ArrayList<ArrayList<Integer>> que = new ArrayList<>();

       for(int i=0; i <q; i++){          
        ArrayList<Integer> midQue = new ArrayList<>();
            for(int j =0; j<2;j++){
                midQue.add(sc.nextInt());
            }
        que.add(midQue);
       }

       //get x,y and check the existence 
       for(int i=0; i <q; i++){      

            int x = que.get(i).get(0) -1;
            int y = que.get(i).get(1)-1;                
                    if (x >= 0 && x < arr.size() && y >= 0 && y < arr.get(x).size()) {                        
                            System.out.println( arr.get(x).get(y));
                    } else {
                            System.out.println("ERROR!");                 

                    }
        }
    }
}

    }